The detained individuals were linked to a group disseminating hate speech primarily targeting children, teenagers, and the LGBTQIA+ community. The supposed leader was arrested for illegal firearm possession in Rio Grande do Sul, while the teenager faced charges of storing child pornography in Rio. Authorities expressed concern over the radicalization of youths, with evidence indicating incitement to self-harm and violence as a means of belonging to the group they identified as "Little Monsters," a fan base for Lady Gaga.

Law enforcement executed search warrants in Rio de Janeiro, Mato Grosso, Rio Grande do Sul, and São Paulo, leading to the seizure of various electronic devices and incriminating materials. The operation, dubbed "Operation Fake Monster," emerged from intelligence reports highlighting online forums that encouraged violence amongst teenagers through coded language and extremist symbols.

To ensure public safety, the concert, aimed at revitalizing Rio’s economy with potential revenues of $100 million (£75 million), featured a robust security apparatus comprising 5,000 officers. Attendees underwent a rigorous screening process, including metal detectors, in addition to surveillance through drones and facial recognition technology.

In light of these developments, the concert proceeded with enhanced security measures, allowing fans to enjoy performances while maintaining safety amidst the thwarted threat.